Thanks a lot for the help! I started adjusting the truss-rod,when its allright,I'll adjust the ramp and pup height.
But its really weird,the string height at the neck pup and bridge pup is different.Ramp was added later,normally,it has a straight surface.The height is different at the both ends of the ramp too.The neck was changed due to a crack on a grain.Maybe that causes it,don't know.
Also G string has more tension than others,fells odd.I lost sustain in time too.Whats going on with my bass?Could it be only a setup issue or something is very wrong with the bass?
Thanks again!